/* DOXA 品牌手册 · brand.css
   格式对齐 TruePick/Shift 品牌书：左 rail + 封面 + 编号章节 + 资产下载
   配色用 DOXA 品牌色：学术靛 #1E2A78 / 纸白 #FAF8F2 / 验证绿 #15A06A / 墨 #14161F
   视觉语言：2px 圆角 · 零阴影 · 1px 细线 · 等宽数字 · 衬线标题 */

:root {
  --paper: #FFFFFF;
  --paper-2: #FAF8F2;   /* 纸白 */
  --paper-3: #F1EEE6;   /* 弱强调块 */
  --ink: #14161F;       /* 墨 */
  --ink-2: #3A3E4A;
  --muted: #5A5E70;
  --faint: #8A8E9C;
  --line: #E4E1D8;
  --line-2: #EDEAE2;
  --indigo: #1E2A78;        /* 学术靛 · 主强调 */
  --indigo-hover: #16205F;
  --green: #15A06A;         /* 验证绿 · 语义（仅"已验证"） */
  --sans: -apple-system, "PingFang SC", "Helvetica Neue", "Microsoft YaHei", "Noto Sans SC", Arial, sans-serif;
  --serif: Georgia, "Source Han Serif SC", "Songti SC", "SimSun", serif;
  --mono: "JetBrains Mono", "SF Mono", ui-monospace, Menlo, monospace;
}

* { box-sizing: border-box; margin: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--paper-2);
  color: var(--ink);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
  line-height: 1.7;
}
::selection { background: var(--indigo); color: #fff; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

/* ---------- 阅读进度条 ---------- */
.reading-progress {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: 3px; background: transparent; pointer-events: none;
}
.reading-progress i {
  display: block; height: 100%; width: 0%;
  background: var(--indigo);
}

/* ---------- 左侧导航 rail ---------- */
.manual-rail {
  position: fixed; inset: 0 auto 0 0; z-index: 40;
  display: flex; flex-direction: column;
  width: 272px; padding: 30px 22px 20px;
  border-right: 1px solid var(--line);
  background: var(--paper-2);
}
.rail-brand { display: flex; align-items: center; gap: 12px; padding-bottom: 22px; border-bottom: 1px solid var(--line); }
.rail-brand__mark { width: 42px; height: 42px; display: grid; place-items: center; }
.rail-brand__mark img { width: 38px; height: 33px; }
.rail-brand__text { display: grid; gap: 1px; }
.rail-brand__text strong { font-family: var(--mono); font-size: 15px; font-weight: 800; letter-spacing: .22em; }
.rail-brand__text small { color: var(--muted); font-size: 10px; letter-spacing: .06em; }

.manual-rail nav { display: flex; flex: 1; flex-direction: column; justify-content: center; gap: 2px; margin: 18px 0; }
.manual-rail nav a {
  display: grid; grid-template-columns: 30px 42px 1fr; align-items: center;
  min-height: 40px; padding: 6px 10px; border-radius: 2px;
  color: var(--ink-2); font-size: 13px; transition: background .15s, color .15s;
}
.manual-rail nav a:hover, .manual-rail nav a.active { background: var(--indigo); color: #fff; }
.manual-rail nav a:hover b, .manual-rail nav a.active b { color: #fff; }
.manual-rail nav b { font-family: var(--mono); font-size: 10px; font-weight: 700; color: var(--indigo); letter-spacing: .06em; }
.manual-rail nav em { font-style: normal; font-weight: 600; }

.rail-links { display: grid; gap: 8px; padding-top: 16px; border-top: 1px solid var(--line); }
.rail-links a {
  display: flex; align-items: center; justify-content: space-between;
  padding: 9px 12px; border: 1px solid var(--line); border-radius: 2px;
  color: var(--ink); font-size: 12px; font-weight: 700; transition: border-color .15s, color .15s;
}
.rail-links a:hover { border-color: var(--indigo); color: var(--indigo); }
.rail-links a img { width: 13px; filter: invert(1) sepia(1) saturate(5) hue-rotate(200deg); opacity: .7; }

.rail-footer { margin-top: 16px; color: var(--faint); font-family: var(--mono); font-size: 9px; letter-spacing: .06em; line-height: 1.8; }

/* ---------- 移动端顶栏 ---------- */
.mobile-bar { display: none; }
.mobile-menu { display: none; }

/* ---------- 主体 ---------- */
.manual-main { margin-left: 272px; }

/* ---------- 封面 ---------- */
.cover {
  position: relative; overflow: hidden;
  display: flex; min-height: 100vh; flex-direction: column; justify-content: space-between;
  padding: 46px clamp(40px, 7vw, 110px);
  background: var(--paper-2);
}
/* 右侧单个 logo 水印（与 Elaine 品牌手册封面同构） */
.cover-art {
  position: absolute; z-index: 1; right: clamp(20px, 4.5vw, 84px); bottom: 11%;
  width: clamp(150px, 16vw, 260px);
  pointer-events: none;
}
.cover-top, .cover-content, .cover-foot { position: relative; z-index: 2; }
.cover-top { display: flex; align-items: center; justify-content: space-between; }
.cover-top__mark { display: flex; align-items: center; gap: 10px; }
.cover-top__mark img { width: 34px; height: 30px; }
.cover-top__mark strong { font-family: var(--mono); font-size: 15px; letter-spacing: .24em; }
.cover-edition { font-family: var(--mono); font-size: 10px; letter-spacing: .12em; color: var(--muted); }

.cover-content { padding: 70px 0 90px; }
.cover-kicker { font-family: var(--mono); font-size: 11px; font-weight: 800; letter-spacing: .2em; color: var(--indigo); margin-bottom: 26px; }
.cover h1 {
  max-width: 800px; margin: 0; font-family: var(--serif); font-weight: 700;
  font-size: clamp(52px, 7.6vw, 116px); letter-spacing: -.045em; line-height: 1.05; color: var(--indigo);
}
.cover h1 em { font-style: normal; border-bottom: 6px solid var(--green); }
.cover-content > p:last-child { max-width: 560px; margin: 40px 0 0; color: var(--ink-2); font-size: clamp(16px, 1.5vw, 20px); line-height: 1.85; }

.cover-foot { display: flex; justify-content: space-between; padding-top: 22px; border-top: 1px solid var(--line); color: var(--muted); font-family: var(--mono); font-size: 10px; letter-spacing: .1em; }
.cover-foot .accent { color: var(--green); }

/* ---------- 序言 ---------- */
.preface { max-width: 1240px; margin: 0 auto; padding: 110px clamp(38px, 7vw, 104px); border-bottom: 1px solid var(--line); }
.preface__grid { display: grid; grid-template-columns: 90px 1fr minmax(240px, .7fr); gap: 34px; align-items: start; }
.preface-index { font-family: var(--mono); font-size: 44px; font-weight: 800; color: var(--indigo); line-height: 1; }
.preface h2 { font-family: var(--serif); font-size: clamp(30px, 3.4vw, 46px); letter-spacing: -.03em; color: var(--ink); margin-bottom: 20px; }
.preface p.lead { color: var(--ink-2); font-size: 16px; line-height: 1.9; max-width: 600px; }
.status-legend { display: grid; gap: 0; border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.status-legend div { padding: 14px 16px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.status-legend b { display: block; font-size: 13px; }
.status-legend span { display: block; margin-top: 4px; color: var(--muted); font-size: 11px; }
.preface .source-note { grid-column: 2 / -1; color: var(--faint); font-size: 12px; margin-top: 8px; }

/* ---------- 通用章节 ---------- */
.chapter { max-width: 1240px; min-height: 70vh; margin: 0 auto; padding: 110px clamp(38px, 7vw, 104px); }
.chapter:nth-of-type(odd) { background: #fffdfa; }
.chapter-header { display: grid; grid-template-columns: 110px minmax(320px, .9fr) minmax(280px, .7fr); gap: 28px; align-items: start; margin-bottom: 64px; }
.chapter-header > span { color: var(--indigo); font-family: var(--mono); font-size: 11px; font-weight: 800; letter-spacing: .12em; }
.chapter-header h2 { margin: -6px 0 0; font-family: var(--serif); font-size: clamp(38px, 4.6vw, 64px); letter-spacing: -.045em; line-height: 1.1; color: var(--ink); }
.chapter-header p { margin: 0; color: var(--muted); font-size: 15px; line-height: 1.8; }

.origin-quote {
  margin: 0 0 36px; padding: 8px 0 8px 28px; border-left: 3px solid var(--indigo);
  font-family: var(--serif); font-size: clamp(26px, 3vw, 40px); font-weight: 700; letter-spacing: -.03em; line-height: 1.4; color: var(--ink);
}
.truth-note { padding: 20px 26px; margin-bottom: 40px; border-left: 3px solid var(--green); background: var(--paper-3); color: var(--ink-2); font-size: 15px; line-height: 1.8; }
.truth-note b { color: var(--ink); }

.three-columns { display: grid; grid-template-columns: 1fr 1fr 1fr; border-top: 1px solid var(--line); border-left: 1px solid var(--line); margin-bottom: 44px; }
.three-columns article { padding: 28px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--paper); }
.three-columns span { color: var(--indigo); font-family: var(--mono); font-size: 10px; font-weight: 800; letter-spacing: .14em; }
.three-columns h3 { margin: 18px 0 12px; font-size: 21px; }
.three-columns p { color: var(--muted); font-size: 14px; line-height: 1.75; }

.values-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.values-grid article { padding: 30px; border: 1px solid var(--line); background: var(--paper); }
.values-grid article:first-child { border-left: 4px solid var(--green); }
.values-grid h3 { font-size: 20px; margin-bottom: 12px; }
.values-grid p { color: var(--muted); font-size: 14px; line-height: 1.75; }

/* 定位 */
.position-statement { padding: 36px; border-top: 3px solid var(--indigo); background: var(--paper-2); margin-bottom: 40px; }
.position-statement h3 { font-family: var(--serif); font-size: clamp(26px, 3vw, 40px); letter-spacing: -.02em; margin-bottom: 12px; color: var(--indigo); }
.position-statement p { color: var(--muted); font-size: 15px; line-height: 1.8; }
.position-statement .slogan-line { margin-top: 18px; padding-top: 14px; border-top: 1px solid var(--line); color: var(--ink); font-size: 16px; line-height: 1.9; }
.position-statement .slogan-line b { display: inline-block; margin-right: 10px; padding: 2px 8px; border-radius: 2px; background: var(--indigo); color: #fff; font-family: var(--mono); font-size: 11px; letter-spacing: 0.1em; vertical-align: 2px; }

.flywheel { display: flex; align-items: stretch; gap: 0; margin-bottom: 44px; border: 1px solid var(--line); background: var(--paper); }
.flywheel > div { flex: 1; padding: 26px 22px; border-right: 1px solid var(--line); }
.flywheel > div:last-child { border-right: 0; }
.flywheel b { display: block; font-family: var(--mono); font-size: 11px; color: var(--indigo); margin-bottom: 10px; }
.flywheel span { font-size: 14px; font-weight: 600; }
.flywheel em { display: block; margin-top: 8px; font-style: normal; color: var(--muted); font-size: 12px; line-height: 1.6; }

.brand-layers { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 18px; margin-bottom: 40px; }
.brand-layers article { padding: 26px; border: 1px solid var(--line); background: var(--paper); }
.brand-layers span { color: var(--indigo); font-family: var(--mono); font-size: 10px; letter-spacing: .12em; }
.brand-layers h3 { margin: 14px 0 10px; font-size: 18px; }
.brand-layers p { color: var(--muted); font-size: 13px; line-height: 1.7; }

.not-list { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.not-list article { padding: 30px; border: 1px solid var(--line); background: var(--paper); }
.not-list article:first-child { border-top: 3px solid var(--indigo); }
.not-list article:last-child { border-top: 3px solid var(--line); }
.not-list h3 { font-size: 19px; margin-bottom: 18px; }
.not-list ul { list-style: none; padding: 0; display: grid; gap: 10px; }
.not-list li { padding-left: 18px; position: relative; color: var(--ink-2); font-size: 14px; line-height: 1.65; }
.not-list li::before { content: "✓"; position: absolute; left: 0; color: var(--green); font-family: var(--mono); }
.not-list article:last-child li::before { content: "✕"; color: var(--muted); }

/* 方法 */
.tag-row { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 36px; }
.tag { display: inline-flex; align-items: center; gap: 8px; padding: 10px 18px; border: 1px solid var(--line); border-radius: 2px; background: var(--paper); font-size: 14px; font-weight: 700; }
.tag i { width: 9px; height: 9px; border-radius: 50%; display: inline-block; }
.tag--verified i { background: var(--green); }
.tag--doubt i { background: #C89B3C; }
.tag--repro i { background: var(--muted); }

.journey { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); margin-bottom: 40px; }
.journey--3 { grid-template-columns: repeat(3, 1fr); }
.journey article { padding: 26px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--paper); }
.journey b { color: var(--indigo); font-family: var(--mono); font-size: 10px; letter-spacing: .1em; }
.journey h3 { margin: 16px 0 10px; font-size: 18px; }
.journey p { color: var(--muted); font-size: 13px; line-height: 1.7; }

.truth-panel { margin-bottom: 40px; padding: 30px 34px; border-left: 4px solid var(--green); background: var(--paper-3); }
.truth-panel h3 { font-size: 21px; margin-bottom: 16px; color: var(--ink); }
.truth-panel ol { list-style: none; padding: 0; display: grid; gap: 12px; counter-reset: tp; }
.truth-panel ol li { counter-increment: tp; display: grid; grid-template-columns: 34px 1fr; gap: 12px; color: var(--ink-2); font-size: 14px; line-height: 1.7; }
.truth-panel ol li::before { content: counter(tp, decimal-leading-zero); font-family: var(--mono); color: var(--green); font-weight: 800; }

/* 数据 */
.data-stack { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-bottom: 36px; }
.data-stack article { padding: 30px; border: 1px solid var(--line); background: var(--paper); }
.data-stack b { color: var(--indigo); font-family: var(--mono); font-size: 11px; }
.data-stack h3 { margin: 14px 0 10px; font-size: 19px; }
.data-stack p { color: var(--muted); font-size: 13px; line-height: 1.7; }
.data-stack .num { font-family: var(--mono); font-size: 34px; font-weight: 800; color: var(--indigo); font-variant-numeric: tabular-nums; display: block; margin-bottom: 6px; }

/* 视觉识别 */
.logo-stage { display: grid; grid-template-columns: 1fr 1fr; min-height: 380px; margin-bottom: 36px; }
.logo-stage > div { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 18px; }
.logo-stage__light { background: #fff; border: 1px solid var(--line); }
.logo-stage__dark { background: var(--indigo); color: #fff; }
.logo-stage img { width: min(160px, 52%); }
.logo-stage .stage-word { font-family: var(--mono); font-size: 13px; letter-spacing: .26em; font-weight: 800; }
.logo-stage .stage-caption { font-family: var(--mono); font-size: 9px; letter-spacing: .14em; opacity: .7; }

.logo-anatomy { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 16px; margin-bottom: 40px; }
.logo-anatomy article { padding: 24px; border: 1px solid var(--line); background: var(--paper); }
.logo-anatomy b { color: var(--indigo); }
.logo-anatomy p { margin-top: 10px; color: var(--muted); font-size: 13px; line-height: 1.7; }

.palette { display: grid; grid-template-columns: repeat(3, 1fr); margin-bottom: 40px; }
.palette article { display: flex; min-height: 210px; flex-direction: column; justify-content: flex-end; padding: 24px; background: var(--swatch); color: var(--swatch-text); }
.palette span { margin-bottom: auto; font-size: 13px; font-weight: 700; }
.palette b { font-family: var(--mono); font-size: 20px; }
.palette small { margin-top: 5px; opacity: .72; }

.type-system { display: grid; gap: 0; margin-bottom: 40px; }
.type-system article { display: grid; grid-template-columns: 170px 1fr 1fr; gap: 24px; align-items: center; padding: 28px 0; border-top: 1px solid var(--line); }
.type-system article:last-child { border-bottom: 1px solid var(--line); }
.type-system span { color: var(--muted); font-family: var(--mono); font-size: 11px; }
.type-system strong { font-size: clamp(22px, 2.6vw, 34px); letter-spacing: -.02em; }
.type-system p { color: var(--muted); font-size: 12px; line-height: 1.7; }
.type-serif strong { font-family: var(--serif); font-weight: 700; }
.type-mono strong { font-family: var(--mono); font-size: clamp(20px, 2.2vw, 30px); }

.do-dont { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.do-dont article { padding: 30px; border: 1px solid var(--line); }
.do-dont article:first-child { background: var(--paper); border-top: 3px solid var(--indigo); }
.do-dont article:last-child { background: var(--paper-3); border-top: 3px solid var(--line); }
.do-dont h3 { font-size: 18px; margin-bottom: 16px; }
.do-dont ul { list-style: none; padding: 0; display: grid; gap: 10px; }
.do-dont li { padding-left: 18px; position: relative; color: var(--ink-2); font-size: 14px; line-height: 1.65; }
.do-dont li::before { content: "✓"; position: absolute; left: 0; color: var(--green); }
.do-dont article:last-child li::before { content: "✕"; color: var(--muted); }

/* 更新记录 */
.updates-principle { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 18px; margin-bottom: 36px; }
.updates-principle article { padding: 22px; border: 1px solid var(--line); background: var(--paper); }
.updates-principle b { color: var(--muted); font-size: 11px; font-weight: 600; display: block; margin-bottom: 8px; }
.updates-principle span { font-size: 15px; font-weight: 700; }
.version-records { display: grid; gap: 12px; }
.version-record { border: 1px solid var(--line); background: var(--paper); }
.version-record summary { display: flex; justify-content: space-between; align-items: center; padding: 18px 24px; cursor: pointer; list-style: none; }
.version-record summary::-webkit-details-marker { display: none; }
.version-record summary b { font-family: var(--mono); color: var(--indigo); }
.version-record summary span { font-size: 14px; font-weight: 700; }
.version-record .vr-body { padding: 0 24px 20px; color: var(--muted); font-size: 13px; line-height: 1.75; }
.updates-note { margin-top: 20px; color: var(--faint); font-size: 12px; }

/* 治理 */
.source-stack { border-top: 1px solid var(--line); border-left: 1px solid var(--line); margin-bottom: 36px; }
.source-stack > div { display: grid; grid-template-columns: 120px 1fr; gap: 18px; padding: 16px 20px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); align-items: center; }
.source-stack b { font-family: var(--mono); font-size: 12px; color: var(--indigo); }
.source-stack span { color: var(--ink-2); font-size: 13px; }
.change-process { display: grid; gap: 0; margin-bottom: 36px; }
.change-process > div { display: grid; grid-template-columns: 40px 1fr; gap: 16px; padding: 16px 0; border-bottom: 1px solid var(--line-2); }
.change-process b { font-family: var(--mono); color: var(--indigo); font-size: 12px; }
.change-process span { color: var(--ink-2); font-size: 14px; }
.manual-meta { display: grid; grid-template-columns: 1fr 1fr; gap: 0; border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.manual-meta div { padding: 18px 22px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.manual-meta b { display: block; color: var(--muted); font-size: 11px; font-weight: 600; margin-bottom: 6px; }
.manual-meta span { font-size: 14px; font-weight: 700; }

/* 联系 */
.channel-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 18px; margin-bottom: 60px; }
.channel-grid article { padding: 30px; border: 1px solid var(--line); background: var(--paper); }
.channel-grid h3 { font-size: 19px; margin-bottom: 12px; }
.channel-grid p { color: var(--muted); font-size: 13px; line-height: 1.7; }
.channel-grid a { color: var(--indigo); font-weight: 700; }
.channel-grid .no { opacity: .55; }

.book-end { padding: 90px clamp(38px, 7vw, 104px); background: var(--indigo); color: #fff; text-align: center; }
.book-end__mark { display: flex; align-items: center; justify-content: center; gap: 12px; margin-bottom: 20px; }
.book-end__mark img { width: 40px; height: 35px; }
.book-end__mark strong { font-family: var(--mono); font-size: 18px; letter-spacing: .28em; }
.book-end p { font-family: var(--serif); font-size: clamp(26px, 3vw, 40px); font-weight: 700; margin-bottom: 30px; }
.book-end__links { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; margin-bottom: 26px; }
.book-end__links a { padding: 12px 24px; border: 1px solid rgba(255,255,255,.4); border-radius: 2px; font-size: 13px; font-weight: 700; transition: background .15s, border-color .15s; }
.book-end__links a:hover { background: rgba(255,255,255,.12); }
.book-end small { font-family: var(--mono); font-size: 10px; letter-spacing: .08em; opacity: .6; }

/* 下一章导航 */
.next-chapter { display: block; margin-top: 80px; padding-top: 20px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; transition: color .15s; }
.next-chapter:hover { color: var(--indigo); }
.next-chapter b { font-weight: 700; }
.next-chapter .arrow { display: inline-block; transition: transform .15s; }
.next-chapter:hover .arrow { transform: translateX(4px); }

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .chapter-header { grid-template-columns: 80px 1fr; }
  .chapter-header p { grid-column: 2; }
  .three-columns, .journey, .journey--3, .brand-layers { grid-template-columns: 1fr 1fr; }
  .palette { grid-template-columns: 1fr 1fr; }
  .not-list, .do-dont, .data-stack { grid-template-columns: 1fr; }
  .preface__grid { grid-template-columns: 70px 1fr; }
  .status-legend { grid-column: 1 / -1; }
  .flywheel { flex-direction: column; }
  .flywheel > div { border-right: 0; border-bottom: 1px solid var(--line); }
  .flywheel > div:last-child { border-bottom: 0; }
  .type-system article { grid-template-columns: 1fr; gap: 8px; }
  .channel-grid { grid-template-columns: 1fr; }
}

@media (max-width: 780px) {
  .manual-rail, .manual-rail.is-open { display: none; transform: none; }
  .mobile-bar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 60;
    display: flex; align-items: center; justify-content: space-between;
    height: 54px; padding: 0 18px;
    background: var(--paper-2); border-bottom: 1px solid var(--line);
  }
  .mobile-brand { display: flex; align-items: center; gap: 9px; }
  .mobile-brand img { width: 26px; height: 23px; }
  .mobile-brand strong { font-family: var(--mono); font-size: 13px; letter-spacing: .2em; }
  .menu-button { padding: 8px 14px; border: 1px solid var(--line); border-radius: 2px; background: #fff; font: 700 12px var(--sans); color: var(--ink); }
  .mobile-menu { display: none; position: fixed; z-index: 59; top: 54px; left: 0; right: 0; background: #fff; border-bottom: 1px solid var(--line); padding: 14px 18px 18px; }
  .mobile-menu.open { display: block; }
  .mobile-menu nav { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
  .mobile-menu nav a { padding: 12px 14px; border: 1px solid var(--line); border-radius: 2px; font-size: 13px; font-weight: 600; }
  .mobile-menu nav a b { color: var(--indigo); font-family: var(--mono); margin-right: 6px; }
  .manual-main { margin-left: 0; padding-top: 54px; }
  .cover { min-height: calc(100svh - 54px); padding: 34px 22px; }
  .cover h1 { font-size: clamp(40px, 11vw, 60px); }
  .cover-art { right: 12px; bottom: 10%; width: clamp(84px, 22vw, 120px); }
  .cover-foot { gap: 10px; flex-direction: column; }
  .chapter, .preface { padding: 70px 22px; }
  .chapter-header { display: block; margin-bottom: 40px; }
  .chapter-header h2 { margin: 12px 0 16px; }
  .three-columns, .journey, .journey--3, .brand-layers, .palette, .values-grid, .logo-anatomy, .updates-principle, .channel-grid { grid-template-columns: 1fr; }
  .logo-anatomy article { min-width: 0; }
  .source-stack > div { grid-template-columns: 1fr; }
  .source-stack span { min-width: 0; overflow-wrap: anywhere; }
  .origin-quote { font-size: 24px; }
}

/* ---------- 全站导航（与 DOXA 官网统一） ---------- */
.site-nav {
  position: sticky; top: 0; z-index: 90;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  min-height: 60px; padding: 0 28px;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}
.brand { display: flex; align-items: center; gap: 8px; }
.brand-icon { display: block; }
.brand-word { font-family: var(--serif); font-weight: 700; letter-spacing: 0.14em; color: var(--indigo); }
.nav-actions { display: flex; align-items: center; gap: 22px; }
.nav-link { font-size: 0.88rem; color: var(--muted); font-weight: 500; transition: color 0.15s; }
.nav-link:hover, .nav-link.is-active { color: var(--indigo); }
.academy-menu { position: relative; }
.academy-menu-link.is-active { color: var(--indigo); }
.academy-menu-toggle {
  border: 0; background: none; color: var(--muted); cursor: pointer; font-size: 0.8rem; padding: 2px 4px;
  transition: transform 0.15s;
}
.academy-menu.open .academy-menu-toggle { transform: rotate(180deg); }
.academy-menu-panel {
  position: absolute; top: calc(100% + 10px); left: 50%; transform: translateX(-50%);
  display: none; min-width: 190px; padding: 8px; background: #fff;
  border: 1px solid var(--line); border-radius: 8px; box-shadow: 0 8px 24px rgba(20, 22, 31, 0.08);
}
.academy-menu.open .academy-menu-panel { display: block; }
.academy-menu-panel a { display: block; padding: 8px 12px; font-size: 0.85rem; color: var(--ink-2); border-radius: 4px; }
.academy-menu-panel a:hover { background: var(--paper-2); color: var(--indigo); }
@media (max-width: 720px) {
  .site-nav { padding: 0 16px; }
  .nav-actions { gap: 14px; overflow-x: auto; scrollbar-width: thin; }
}

/* ---------- 全站页脚（与 DOXA 官网统一：居中堆叠） ---------- */
.site-footer { background: var(--indigo); color: #fff; padding: 44px 0; }
.site-footer .footer-inner {
  max-width: 1180px; margin-inline: auto; padding: 0 24px; text-align: center;
}
.footer-top { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 8px 16px; }
.footer-brand { display: inline-flex; align-items: center; justify-content: center; gap: 10px; font-family: var(--serif); letter-spacing: 0.15em; }
.footer-brand img { display: block; }
.footer-slogan { margin: 0; color: rgba(255, 255, 255, 0.8); font-size: 0.85rem; }
.footer-copyright { margin: 14px 0 0; color: rgba(255, 255, 255, 0.5); font-size: 0.72rem; }

/* ---------- 学院徽章（五院同源 SVG） ---------- */
.academy-badges { margin-bottom: 40px; }
.academy-badges h3 { margin: 0 0 6px; font-size: 19px; color: var(--indigo); }
.academy-badges > p { margin: 0 0 18px; color: var(--muted); font-size: 13px; }
.academy-badges .data-stack { grid-template-columns: repeat(5, 1fr); gap: 12px; }
.academy-badges .data-stack article { text-align: center; padding: 22px 12px; }
@media (max-width: 820px) {
  .academy-badges .data-stack { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 520px) {
  .academy-badges .data-stack { grid-template-columns: repeat(2, 1fr); }
}
.academy-badges .data-stack img { width: 64px; height: 64px; margin: 0 auto 14px; display: block; }
.academy-badges .data-stack b { font-family: var(--sans); font-size: 13px; font-weight: 700; color: var(--ink); display: block; margin-bottom: 4px; }
.academy-badges .data-stack p { font-size: 12px; }

/* 2026-08-12 品牌手册独立格式：浮动移动端目录按钮（替代原顶栏 menuBtn） */
.menu-btn-floating { display: none; }
@media (max-width: 780px) {
  .menu-btn-floating {
    display: block; position: fixed; left: 12px; bottom: 16px; z-index: 90;
    padding: 10px 14px; border: 1px solid var(--line); border-radius: 999px;
    background: #fff; color: var(--ink); font: 700 12px var(--sans);
    box-shadow: 0 2px 10px rgba(0,0,0,.12); cursor: pointer;
  }
  .menu-btn-floating:hover { background: var(--indigo); color: #fff; }
}